Fix linux compile issues

Author: scriptorian

src/encode.cc

@@ -138,7 +138,8 @@ napi_value encoder(napi_env env, napi_callback_info info) {
       (encoder->sample_rate > 0) && (encoder->channel_layout != 0)) {
     // For audio encodes open the encoder if sufficient parameters have been provided
     // Encoder specific parameters will then be set up and available before the first encode
-    if (ret = avcodec_open2(encoder, encoder->codec, nullptr)) {
+    ret = avcodec_open2(encoder, encoder->codec, nullptr);
+    if (ret) {
       NAPI_THROW_ERROR(avErrorMsg("Failed to open audio encoder: ", ret));
     }
   }

src/hwcontext.cc

@@ -70,9 +70,9 @@ napi_value getHWDeviceCtxType(napi_env env, napi_callback_info info) {
     case AV_HWDEVICE_TYPE_MEDIACODEC:
       name = "mediacodec";
       break;
-    case AV_HWDEVICE_TYPE_VULKAN:
-      name = "vulkan";
-      break;
+    // case AV_HWDEVICE_TYPE_VULKAN:
+    //   name = "vulkan";
+    //   break;
     default:
       name = nullptr;
       break;